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Re: test for "command not found" before expanding shell parameters


From: Andreas Schwab
Subject: Re: test for "command not found" before expanding shell parameters
Date: Mon, 21 Apr 2014 11:16:48 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Alan Young <address@hidden> writes:

> greo=$(command -v greo)
>
> if [ -n $greo ]; then
>   $greo ...
> fi
>
> command will search the directories defined in $PATH for the command
> greo and return the fully qualified path.  If it isn't found it will
> return null.  So, if $greo is non-zero, greo exists and you can run
> it.

And if $greo is null the condition will also be true.

Andreas.

-- 
Andreas Schwab, address@hidden
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